Accession Number : AD0810909
Title : MEASUREMENTS OF SPATIAL COHERENCE IN 3.2-MM HORIZONTAL TRANSMISSION.
Descriptive Note : Rept. for 1 Jul 65-1 Oct 66,
Corporate Author : AEROSPACE CORP EL SEGUNDO CA LABS DIV
Personal Author(s) : Etcheverry, R. D. ; Heidbreder, G. R. ; Johnson, W. A. ; Wintroub, H. J.
Report Date : JAN 1967
Pagination or Media Count : 34
Abstract : An experiment designed to measure wavefront statistics in 3.2-mm wavelength horizontal transmission over an 18.95-km path is described. A frequency-stabilized signal is transmitted over the path and is received in two spaced antennas having variable separation. The receivers are instrumented to measure phase difference and amplitude fluctuations. A simultaneous beam-swinging experiment using a precision-controlled 4.57-m antenna colocated with the phase difference receivers provides data on wavefront tilt fluctuations. Preliminary results indicate that the random wavefront tilt is the predominant atmosphere-induced wavefront phase disturbance. They further suggest that spatial coherence of wavefronts is of sufficient extent that apertures in excess of 7 m in diam are feasible at the 3.2-mm wavelength. (Author)
Descriptors : (*COHERENT RADIATION, MILLIMETER WAVES), (*WAVE PROPAGATION, MILLIMETER WAVES), PROPAGATION, PHASE MEASUREMENT, PHASE SHIFT CIRCUITS, DIVERSITY RECEPTION, ATMOSPHERES, ATMOSPHERIC MOTION, SCINTILLATION.
Subject Categories : Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE